Android提示版本号更新操作流程

Android提示版本号更新操作流程

2014年5月8日：

andorid的app应用中都会有版本号更新的操作,今天空暇的时候就花了点心思弄了一下。主要技术方面用到了AsyncTask异步载入、http协议、json解析、获取版本号号等。。

。

以下就来介绍一下大概的流程吧。首先呢：

activity_main.xml：

    <Button
        android:id="@+id/chek_newest_version"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dip"
        android:text="检測最新版本号"/>

这里我就仅仅用了一个button了！

接下来mainactivity代码：

启动了异步载入来处理的，假设旧版本号小于新版本号号，就開始运行下载操作，否则就不更新！

一步步看吧！

public class MainActivity extends Activity {

	Button m_btnCheckNewestVersion;
	long m_newVerCode; //最新版的版本号号
	String m_newVerName; //最新版的版本号名
	String m_appNameStr; //下载到本地要给这个APP命的名字

	Handler m_mainHandler;
	ProgressDialog m_progressDlg;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		//初始化相关变量
		initVariable();

		m_btnCheckNewestVersion.setOnClickListener(btnClickListener);
	}
	private void initVariable()
	{
		m_btnCheckNewestVersion = (Button)findViewById(R.id.chek_newest_version);
		m_mainHandler = new Handler();
		m_progressDlg =  new ProgressDialog(this);
		m_progressDlg.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
		 // 设置ProgressDialog 的进度条是否不明白 false 就是不设置为不明白
		m_progressDlg.setIndeterminate(false);
		m_appNameStr = "haha.apk";
	}

	OnClickListener btnClickListener = new View.OnClickListener() {

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			new checkNewestVersionAsyncTask().execute();
		}
	};

	class checkNewestVersionAsyncTask extends AsyncTask<Void, Void, Boolean>
	{

		@Override
		protected Boolean doInBackground(Void... params) {
			// TODO Auto-generated method stub
			if(postCheckNewestVersionCommand2Server())
			{
				int vercode = Common.getVerCode(getApplicationContext()); // 用到前面第一节写的方法
		         if (m_newVerCode > vercode) {
		             return true;
		         } else {
		             return false;
		         }
			}
			return false;
		}

		@Override
		protected void onPostExecute(Boolean result) {
			// TODO Auto-generated method stub
			if (result) {//假设有最新版本号
				doNewVersionUpdate(); // 更新新版本号
			}else {
				notNewVersionDlgShow(); // 提示当前为最新版本号
			}
			super.onPostExecute(result);
		}

		@Override
		protected void onPreExecute() {
			// TODO Auto-generated method stub
			super.onPreExecute();
		}
	}

	/**
	 * 从服务器获取当前最新版本号号，假设成功返回TURE，假设失败。返回FALSE
	 * @return
	 */
	private Boolean postCheckNewestVersionCommand2Server()
	{
		StringBuilder builder = new StringBuilder();
		JSONArray jsonArray = null;
		try {
			// 构造POST方法的{name:value} 參数对
			List<NameValuePair> vps = new ArrayList<NameValuePair>();
			// 将參数传入post方法中
			vps.add(new BasicNameValuePair("action", "checkNewestVersion"));
			builder = Common.post_to_server(vps);
			Log.e("msg", builder.toString());
			jsonArray = new JSONArray(builder.toString());
			if (jsonArray.length()>0) {
				if (jsonArray.getJSONObject(0).getInt("id") == 1) {
					m_newVerName = jsonArray.getJSONObject(0).getString("verName");
					m_newVerCode = jsonArray.getJSONObject(0).getLong("verCode");

					return true;
				}
			}

			return false;
		} catch (Exception e) {
			Log.e("msg",e.getMessage());
			m_newVerName="";
			m_newVerCode=-1;
			return false;
		}
	}

	/**
	 * 提示更新新版本号
	 */
	private void doNewVersionUpdate() {
		int verCode = Common.getVerCode(getApplicationContext());
	    String verName = Common.getVerName(getApplicationContext());  

	    String str= "当前版本号："+verName+" Code:"+verCode+" ,发现新版本号："+m_newVerName+
	    		" Code:"+m_newVerCode+" ,是否更新？";
	    Dialog dialog = new AlertDialog.Builder(this).setTitle("软件更新").setMessage(str)
	            // 设置内容
	            .setPositiveButton("更新",// 设置确定button
	                    new DialogInterface.OnClickListener() {
	                        @Override
	                        public void onClick(DialogInterface dialog,
	                                int which) {
	                            m_progressDlg.setTitle("正在下载");
	                            m_progressDlg.setMessage("请稍候...");
	                            downFile(Common.UPDATESOFTADDRESS);  //開始下载
	                        }
	                    })
	            .setNegativeButton("暂不更新",
	                    new DialogInterface.OnClickListener() {
	                        public void onClick(DialogInterface dialog,
	                                int whichButton) {
	                            // 点击"取消"button之后退出程序
	                            finish();
	                        }
	                    }).create();// 创建
	    // 显示对话框
	    dialog.show();
	}
		/**
		 *  提示当前为最新版本号
		 */
		private void notNewVersionDlgShow()
		{
			int verCode = Common.getVerCode(this);
		    String verName = Common.getVerName(this);
		    String str="当前版本号:"+verName+" Code:"+verCode+",/n已是最新版,无需更新!";
		    Dialog dialog = new AlertDialog.Builder(this).setTitle("软件更新")
		            .setMessage(str)// 设置内容
		            .setPositiveButton("确定",// 设置确定button
		                    new DialogInterface.OnClickListener() {
		                        @Override
		                        public void onClick(DialogInterface dialog,
		                                int which) {
		                            finish();
		                        }
		                    }).create();// 创建
		    // 显示对话框
		    dialog.show();
		}
		private void downFile(final String url)
		{
			m_progressDlg.show();
		    new Thread() {
		        public void run() {
		            HttpClient client = new DefaultHttpClient();
		            HttpGet get = new HttpGet(url);
		            HttpResponse response;
		            try {
		                response = client.execute(get);
		                HttpEntity entity = response.getEntity();
		                long length = entity.getContentLength();  

		                m_progressDlg.setMax((int)length);//设置进度条的最大值

		                InputStream is = entity.getContent();
		                FileOutputStream fileOutputStream = null;
		                if (is != null) {
		                    File file = new File(
		                            Environment.getExternalStorageDirectory(),
		                            m_appNameStr);
		                    fileOutputStream = new FileOutputStream(file);
		                    byte[] buf = new byte[1024];
		                    int ch = -1;
		                    int count = 0;
		                    while ((ch = is.read(buf)) != -1) {
		                        fileOutputStream.write(buf, 0, ch);
		                        count += ch;
		                        if (length > 0) {
		                        	 m_progressDlg.setProgress(count);
		                        }
		                    }
		                }
		                fileOutputStream.flush();
		                if (fileOutputStream != null) {
		                    fileOutputStream.close();
		                }
		                down();  //告诉HANDER已经下载完毕了，能够安装了
		            } catch (ClientProtocolException e) {
		                e.printStackTrace();
		            } catch (IOException e) {
		                e.printStackTrace();
		            }
		        }
		    }.start();
		}
		/**
		 * 告诉HANDER已经下载完毕了，能够安装了
		 */
		private void down() {
	        m_mainHandler.post(new Runnable() {
	            public void run() {
	                m_progressDlg.cancel();
	                update();
	            }
	        });
	}
		/**
		 * 安装程序
		 */
	    void update() {
	        Intent intent = new Intent(Intent.ACTION_VIEW);
	        intent.setDataAndType(Uri.fromFile(new File(Environment
	                .getExternalStorageDirectory(), m_appNameStr)),
	                "application/vnd.android.package-archive");
	        startActivity(intent);
	    }

}

最后是Common.java类:

类似一个工具类。非常多方法都写在这里面。下载完毕后，開始运行安装的操作！

public class Common {
	public static final String SERVER_IP="http://192.168.1.105/";
	public static final String SERVER_ADDRESS=SERVER_IP+"try_downloadFile_progress_server/index.php";//软件更新包地址
	public static final String UPDATESOFTADDRESS=SERVER_IP+"try_downloadFile_progress_server/update_pakage/baidu.apk";//软件更新包地址

	/**
	 * 向服务器发送查询请求，返回查到的StringBuilder类型数据
	 *
	 * @param ArrayList
	 *            <NameValuePair> vps POST进来的參值对
	 * @return StringBuilder builder 返回查到的结果
	 * @throws Exception
	 */
	public static StringBuilder post_to_server(List<NameValuePair> vps) {
		DefaultHttpClient httpclient = new DefaultHttpClient();
		try {
			HttpResponse response = null;
			// 创建httpost.訪问本地服务器网址
			HttpPost httpost = new HttpPost(SERVER_ADDRESS);
			StringBuilder builder = new StringBuilder();

			httpost.setEntity(new UrlEncodedFormEntity(vps, HTTP.UTF_8));
			response = httpclient.execute(httpost); // 运行

			if (response.getEntity() != null) {
				// 假设服务器端JSON没写对。这句是会出异常。是运行只是去的
				BufferedReader reader = new BufferedReader(
						new InputStreamReader(response.getEntity().getContent()));
				String s = reader.readLine();
				for (; s != null; s = reader.readLine()) {
					builder.append(s);
				}
			}
			return builder;

		} catch (Exception e) {
			// TODO: handle exception
			Log.e("msg",e.getMessage());
			return null;
		} finally {
			try {
				httpclient.getConnectionManager().shutdown();// 关闭连接
				// 这两种释放连接的方法都能够
			} catch (Exception e) {
				// TODO Auto-generated catch block
				Log.e("msg",e.getMessage());
			}
		}
	}

	/**
	 * 获取软件版本号号
	 * @param context
	 * @return
	 */
	public static int getVerCode(Context context) {
        int verCode = -1;
        try {
        	//注意："com.example.try_downloadfile_progress"相应AndroidManifest.xml里的package="……"部分
            verCode = context.getPackageManager().getPackageInfo(
                    "com.example.try_downloadfile_progress", 0).versionCode;
        } catch (NameNotFoundException e) {
        	Log.e("msg",e.getMessage());
        }
        return verCode;
    }
   /**
    * 获取版本号名称
    * @param context
    * @return
    */
    public static String getVerName(Context context) {
        String verName = "";
        try {
            verName = context.getPackageManager().getPackageInfo(
                    "com.example.try_downloadfile_progress", 0).versionName;
        } catch (NameNotFoundException e) {
        	Log.e("msg",e.getMessage());
        }
        return verName;
}

已经贴完成！